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In the relm of drip irrigation, "pressure compensating" means that a drip emitter will put out ABOUT the same amount of water regardless of the incomming pressure. Notice how the green one your link goes to is listed as a flow rate of 20 Gallons Per Hour? That means this device will put out ABOUT 20 GPH for incomming pressures between 10-60psi. By comparison, the Black colored device puts out 6GPH, the Blue 2GPH, and the Red 12GPH.

Not sure about the requirements on filtration. Drip irrigation usually needs filtration of 150-ish mesh or finer for drip emitters. So my best guess is that the water coming to this device should be on a 120 mesh filter (something all irrigation systems SHOULD have, but very few do from what I understand).

Infering can cause problems. For instance, the item description says it compensates from 10-60 PSI, but operates at 10-50 PSI. It also says it has a built-in filter, but does not specify what that filter is, and then goes on to further say that 120 mesh is required. I would much rather KNOW what I am buying and what is required, than infer and make the wrong asumption. Being a sprinkler laymen, I'd like to know the difference and have clarification before I make my two HUNDRED (and rising) dollar purchase, only a small part of which is six, two dollar items.

There is no clarification. If you fail to realize that a drip component requires a filtered pressure-regulated water supply, then you are not ready for prime time. Rainbird sells me a device to filter and regulate water for drip, and it's close to twenty bucks. You think a two-dollar device from DiG is going to accomplish the same thing, and also include four emitters? Not likely.